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  1. By: Perrins, C M - Mccleery, R H
    Type: Article
    In: The Wilson bulletin
    Volume: 101
    Issue: 2
    Date: 1989
    Page Range: 236--253
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Geer, T A - Perrins, C M
    Type: Article
    In: Raptor research
    Volume: 15
    Issue: 2
    Date: 1981
    Page Range: 45--48
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]